Can the suit neck (collar) be adjusted?
No, the neck does not come with velcro flap and cannot be adjusted.
Thanks, sounds good.
Not sure what is meant by "adjusted." I just got this suit and haven't tried to use it in water yet. Very comfortable and the zip up front is nice. As to adjusting the neck... This is like a jacket. if it's too tight, loosen the zipper an inch or so. That's the only way I've found to "adjust" the neck.
There isn't a neck adjustment per se, but the purpose is achieved with the front zipper. If it's zipped up all the way you have maximum neck insulation and loosening the zipper gives you a looser fit around the neck.
No, the collar is fixed it does not have a Velcro adjustment like a rear zippered suit. But it does a good job at limiting water entering through the neck. I have used the suit in water temps down to 55*F with no hood and I was comfortable.